Add estimate-marking awareness and a second fact-check round (E3)

Why: The E1 live comparison was the only metric that got worse
(unverifiedFacts 7 -> 12): the gate gave one correction round and then
shipped bare numbers. The design (E3) calls for number sourcing with a
mechanically checkable marking escape: numbers labeled as
targets/assumptions are honest planning quantities, not fabricated
facts, so the gate must let them pass - and the model must be told that
marking is the sanctioned way out.

Why: The marking decision is clause-scoped, not a fixed window - a
window wrongly blessed "3,500" because a neighboring clause said
"target 85%" (caught by the existing test). The second round only
fires when the unverified set actually changed, because the
continuation budget is shared across all final gates and a repeat
block on identical tokens starves the downstream gates (also caught by
an existing test).

Evidence: go test ./... green; new anchors TestMarkedAsEstimate,
TestUnverifiedFactsMarksPass, TestFactCheckGateRounds; the live eval
gains an unverifiedUnmarkedFacts field sharing the same marking rule.

Impact: base.deliverables v6 adds the hard number-sourcing rule;
research/explore/general sub-agent profiles v+1 require citations for
key numbers; fact gate: marked-in-clause numbers pass, round 2
escalates to "last interception" with the marking instruction, then
passes through with the check line. Eval report keeps the strict
series and adds the E3-series field.

Refs: proposal 2026-10-10-agent-delegation-routing-sandbox.md (E3,
D4); Dev task feature/agent-e3-evidence-gate.

eval/live/helpers_test.go

@@ -17,6 +17,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"agent-system-backend/internal/runtime"
 )
 
 // upload 上传一个材料文件，返回 artifact id。
@@ -377,6 +379,18 @@ func unverifiedFacts(artifactText, materialText string) []string {
 	return out
 }
 
+// unmarkedFacts 从未核实清单里剔除已按「目标/预计/假设」标注的（与后端
+// runtime.MarkedAsEstimate 同一口径，标注词邻域 ±32 字符）。
+func unmarkedFacts(tokens []string, artifactText string) []string {
+	var out []string
+	for _, tok := range tokens {
+		if !runtime.MarkedAsEstimate(artifactText, tok) {
+			out = append(out, tok)
+		}
+	}
+	return out
+}
+
 // finalVsArtifact 终轮回复里声称的章节（「一、…」）必须能在工件里找到。
 func finalVsArtifact(turn *turnResult, artifactText string) []string {
 	if turn == nil || turn.FinalText == "" || strings.TrimSpace(artifactText) == "" {
@@ -430,6 +444,9 @@ func renderMarkdown(rep *report) string {
 		}
 		if len(tk.UnverifiedFacts) > 0 {
 			fmt.Fprintf(&b, "\n未核实事实（工件里出现、材料里找不到）：%s\n", strings.Join(tk.UnverifiedFacts, "、"))
+		if len(tk.UnverifiedUnmarkedFacts) > 0 {
+			fmt.Fprintf(&b, "其中未标注（无出处且无目标/预计/假设标注，E3 闸门口径）：%s\n", strings.Join(tk.UnverifiedUnmarkedFacts, "、"))
+		}
 		}
 		if len(tk.FinalVsArtifact) > 0 {
 			fmt.Fprintf(&b, "\n终轮声称但工件不存在的章节：%s\n", strings.Join(tk.FinalVsArtifact, "；"))

eval/live/live_test.go

@@ -252,6 +252,9 @@ type taskResult struct {
 	Turns           []turnResult `json:"turns"`
 	Total           turnMetrics  `json:"total"`
 	UnverifiedFacts []string     `json:"unverifiedFacts,omitempty"`
+	// UnverifiedUnmarkedFacts：无出处且未按「目标/预计/假设」标注的子集
+	// （E3 口径：严格口径 unverifiedFacts 保留原义以维持历史可比性）。
+	UnverifiedUnmarkedFacts []string `json:"unverifiedUnmarkedFacts,omitempty"`
 	FinalVsArtifact []string     `json:"finalVsArtifact,omitempty"`
 }
 
@@ -307,6 +310,7 @@ func runTask(t *testing.T, c *client, projectID string, tk task, materialsDir st
 				artText += downloadArtifactText(t, c, projectID, name)
 			}
 			tr.UnverifiedFacts = unverifiedFacts(artText, materialText)
+			tr.UnverifiedUnmarkedFacts = unmarkedFacts(tr.UnverifiedFacts, artText)
 			tr.FinalVsArtifact = finalVsArtifact(last, artText)
 		}
 	}